compiler: free local_vars

compiler/parser.v

@@ -51,6 +51,8 @@ mut:
 	ptr_cast       bool
 	calling_c      bool
 	cur_fn         Fn
+	local_vars     []Var // local function variables
+	var_idx       int
 	returns        bool
 	vroot          string
 	is_c_struct_init bool
@@ -107,6 +109,7 @@ fn (v mut V) new_parser(path string) Parser {
 		pref: v.pref
 		os: v.os
 		vroot: v.vroot
+		local_vars: [Var{}].repeat(MaxLocalVars)
 			
 	}
 	$if js {
@@ -303,7 +306,7 @@ fn (p mut Parser) parse(pass Pass) {
 				if p.cur_fn.name == '' {
 					p.set_current_fn( MainFn )
 					if p.pref.is_repl {
-						p.cur_fn.clear_vars()
+						p.clear_vars()
 					}
 				}
 				mut start := p.cgen.lines.len
@@ -848,18 +851,18 @@ fn (p mut Parser) get_type() string {
 	// multiple returns
 	if p.tok == .lpar {
 		// if p.inside_tuple {p.error('unexpected (')}
-		// p.inside_tuple = true 
-		p.check(.lpar) 
-		mut types := []string 
+		// p.inside_tuple = true
+		p.check(.lpar)
+		mut types := []string
 		for {
 			types << p.get_type()
 			if p.tok != .comma {
-				break 
-			} 
-			p.check(.comma) 
+				break
+			}
+			p.check(.comma)
 		}
-		p.check(.rpar) 
-		// p.inside_tuple = false 
+		p.check(.rpar)
+		// p.inside_tuple = false
 		return 'MultiReturn_' + types.join('_Z_').replace('*', '_ZptrZ_')
 	}
 	// fn type
@@ -1110,9 +1113,9 @@ fn (p mut Parser) close_scope() {
 	// Move back `var_idx` (pointer to the end of the array) till we reach
 	// the previous scope level.  This effectivly deletes (closes) current
 	// scope.
-	mut i := p.cur_fn.var_idx - 1
+	mut i := p.var_idx - 1
 	for ; i >= 0; i-- {
-		v := p.cur_fn.local_vars[i]
+		v := p.local_vars[i]
 		//if p.cur_fn.name == 'main' {
 			//println('var in main $v.name $v.typ $v.is_alloc ptr=$v.ptr')
 		//}	
@@ -1152,7 +1155,7 @@ fn (p mut Parser) close_scope() {
 	}
 	p.cur_fn.scope_level--
 	p.cur_fn.defer_text = p.cur_fn.defer_text.left(p.cur_fn.scope_level + 1)
-	p.cur_fn.var_idx = i + 1
+	p.var_idx = i + 1
 	// println('close_scope new var_idx=$f.var_idx\n')
 }
 
@@ -1191,7 +1194,7 @@ fn (p mut Parser) statement(add_semi bool) string {
 			p.check(.colon)
 			return ''
 		}
-		// `a := 777` 
+		// `a := 777`
 		else if p.peek() == .decl_assign || p.peek() == .comma {
 			p.log('var decl')
 			p.var_decl()
@@ -1385,7 +1388,7 @@ fn (p mut Parser) var_decl() {
 		// p.var_decl_name = name
 		// Don't allow declaring a variable with the same name. Even in a child scope
 		// (shadowing is not allowed)
-		if !p.builtin_mod && p.cur_fn.known_var(name) {
+		if !p.builtin_mod && p.known_var(name) {
 			// v := p.cur_fn.find_var(name)
 			p.error('redefinition of `$name`')
 		}
@@ -1563,7 +1566,7 @@ fn (p mut Parser) name_expr() string {
 	// module ?
 	// (Allow shadowing `gg = gg.newcontext(); gg.draw_triangle();` )
 	if p.peek() == .dot && ((name == p.mod && p.table.known_mod(name)) || p.import_table.known_alias(name))
-		&& !p.cur_fn.known_var(name) && !is_c {
+		&& !p.known_var(name) && !is_c {
 		mut mod := name
 		// must be aliased module
 		if name != p.mod && p.import_table.known_alias(name) {
@@ -1577,7 +1580,7 @@ fn (p mut Parser) name_expr() string {
 		p.fgen(name)
 		name = prepend_mod(mod, name)
 	}
-	else if !p.table.known_type(name) && !p.cur_fn.known_var(name) &&
+	else if !p.table.known_type(name) && !p.known_var(name) &&
 	!p.table.known_fn(name) && !p.table.known_const(name) && !is_c {
 		name = p.prepend_mod(name)
 	}
@@ -1713,7 +1716,7 @@ fn (p mut Parser) name_expr() string {
 				//f = p.table.find_fn(name)
 			}
 			// check for misspelled function / variable / module
-			suggested := p.table.identify_typo(name, p.cur_fn, p.import_table)
+			suggested := p.identify_typo(name, p.import_table)
 			if suggested != '' {
 				p.error('undefined: `$name`. did you mean:$suggested')
 			}
@@ -2478,7 +2481,7 @@ fn (p mut Parser) assoc() string {
 	// println('assoc()')
 	p.next()
 	name := p.check_name()
-	var := p.cur_fn.find_var(name) or {
+	var := p.find_var(name) or {
 		p.error('unknown variable `$name`')
 		exit(1)
 	}	
@@ -3649,7 +3652,7 @@ fn (p mut Parser) go_statement() {
 	// Method
 	if p.peek() == .dot {
 		var_name := p.lit
-		v := p.cur_fn.find_var(var_name) or { return }
+		v := p.find_var(var_name) or { return }
 		p.mark_var_used(v)
 		p.next()
 		p.check(.dot)
@@ -3667,14 +3670,16 @@ fn (p mut Parser) go_statement() {
 	}
 }
 
+/*
 fn (p mut Parser) register_var(v Var) {
 	if v.line_nr == 0 {
 		spos := p.scanner.get_scanner_pos()
-		p.cur_fn.register_var({ v | scanner_pos: spos, line_nr: spos.line_nr })
+		p.register_var({ v | scanner_pos: spos, line_nr: spos.line_nr })
 	} else {
-		p.cur_fn.register_var(v)
+		p.register_var(v)
 	}
 }
+*/
 
 // user:=jsdecode(User, user_json_string)
 fn (p mut Parser) js_decode() string {